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Unnamed Occurrence (ARDF - MD003), McGrath District, Yukon-Koyukuk Borough, Alaska, USA

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See MD001 and MD002.
Location: Occurrence is situated on a broad east-west ridge at an elevation of 1,700 feet (518 m) in Section 6, T. 18 S., R. 30 E., of the Kateel River Meridian. The location is based on descriptions from Clautice and others (1993).
Geology: Miller and others (1980) reported anomalous thorium and uranium values from the Sischu Volcanics. Clautice and others (1993) report large sanadine crystals in felsic altered volcanic units in this area. The age of the mineral occurrence is inferred to be Early Tertiary, based on isotopic ages of Sischu Volcanics (Moll and others, 1981). Four grab samples collected by Miller and others (1980) contained from 28.0 to 70.3 ppm uranium and from 108 to 127 ppm thorium.
Workings: Four grab samples collected by Miller and others (1980) contained from 28.0 to70.3 ppm uranium and from 108 to 127 ppm thorium.
Age: Early Tertiary based isotopic ages from Sischu Volcanics (Moll and others, 1981).
Reserves: None.

Commodities (Major) - Th, U; (Minor) - REE
Development Status: No
Deposit Model: Volcanogenic Uranium (Cox and Singer, 1986; model no. 25f)

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Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles); References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000. Miller, T.P., Moll, E.J., and Patton, W.W. Jr., 1980, Uranium and thorium rich volcanic rocks of the Sischu Creek area, Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-803, 9 p.

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